About aiohttp's method of adding static resource paths

The so-called static resources refer to pictures, js, css and other files. The official instructions are here.
Take a small project to illustrate. The following is the directory structure of the project :

.
├── static
│   ├── css
│   │   ├── base.css
│   │   ├── bootstrap.min.css
│   │   └── font-awesome.min.css
│   ├── font
│   │   ├── FontAwesome.otf
│   │   ├── fontawesome-webfont.eot
│   │   ├── fontawesome-webfont.svg
│   │   ├── fontawesome-webfont.ttf
│   │   └── fontawesome-webfont.woff
│   └── index.html
└── proxy_server.py

Give 2 static file directories in proxy_server.pystatic /css and static/fontAdd routing:

 app.router.add_static('/css/',
                       path='static/css',
                       name='css')
 app.router.add_static('/font/',
                       path='static/font',
                       name='font')

Let’s first look at the definition of the add_static method:

def add_static(self, prefix, path, *, name=None, expect_handler=None,
                   chunk_size=256*1024, response_factory=StreamResponse,
                   show_index=False, follow_symlinks=False):
        """Add static files view.

        prefix - url prefix
        path - folder with files

        """
        # TODO: implement via PrefixedResource, not ResourceAdapter
        assert prefix.startswith('/')
        if prefix.endswith('/'):
            prefix = prefix[:-1]
        resource = StaticResource(prefix, path,
                                  name=name,
                                  expect_handler=expect_handler,
                                  chunk_size=chunk_size,
                                  response_factory=response_factory,
                                  show_index=show_index,
                                  follow_symlinks=follow_symlinks)
        self.register_resource(resource)
        return resource

Required 2 parameters:
prefix: is the prefix of the url of the static file, starting with /, on the browser address bar Displayed after the website host, it is also used for index.htmlstatic pages to reference
path: The path to the static file directory, which can be a relative path. The static/css used in the above code is a relative path - relative to the path where proxy_server.py is located.
The following is the effect of the page:

Loads index.html, and the following is the code that references static resources:

Add## The path of #font is because /font-awesome.min.css needs to be used:
Open the css file in the browser:

You can see that the prefix of the url is
/css/. If you modify the prefix:

 app.router.add_static('/css2017/',
                       path='static/css',
                       name='css')

css file is also inaccessible:

Modify
index. Reference path of css in html:

css, it has been regarded as css2017## through add_static #, the page has returned to normal:
css file can also be opened:

url prefix has become /css2017/
. At this time, open the index.html
file directly and it will be displayed as
because there is no css2017
in the static directory folder. Now we understand that the

add_static basically uses the method. You can also hide the actual static storage on the server by redefining the prefix parameter. The directory of resources can also unify resource files scattered everywhere under the same path prefix. In addition, if you add

, you can display the directory index of the static resources - access is prohibited by default:

app.router.add_static('/css2017/',
                       path='static/css',
                       name='css',
                       show_index=True)

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